For each of the physiological changes A–E, select the most appropriate option from the possible precipitating causes listed below.
Fainting.
Severe haemorrhage.
Severe exercise.
Late pregnancy.
Hypothermia.
Lying down.
A. A fall in the haematocrit.
B. A decrease in heart rate.
C. A decrease in oxygen consumption.
D. A reduction in venous capacity.
E. An increased right atrial pressure.